Date: c. 501 B.C.

"A dry gleam of light is the wisest and best soul."

— Heraklitus (fl. 504-1 BCE)

Date: 1704

"The first ingredient toward the art of canting, is, a competent share of inward light; that is to say, a large memory plentifully fraught with theological polysyllables, and mysterious texts from holy writ, applied and digested by those methods and mechanical operations already related:...

— Swift, Jonathan (1667-1745)

Date: 1704

"Remark your commonest pretender to a light within, how dark, and dirty, and gloomy he is without; as lanterns which, the more light they bear in their bodies, cast out so much the more soot and smoke and fuliginous matter to adhere to the sides."

— Swift, Jonathan (1667-1745)

Date: 1775

"What fancied zone can circumscribe the Soul, / Who, conscious of the source from whence she springs, / By Reason's light on Resolution's wings, / Spite of her frail / companion, dauntless goes / O'er Libya's deserts and through Zembla's snows? "

— Gray, Thomas (1716-1771)

Date: w. 1821, 1840

"Reason is to imagination as the instrument to the agent, as the body to the spirit, as the shadow to the substance."

— Shelley, Percy Bysshe (1792-1822)